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MECHANISMS, 220px-Lever_(PSF), descarga, descarga (1), descarga (2),…

- - - - Class 1- The fulcrum is between the effort applied and the resistance.
      - Class 3- The effort applied is between the fulcrum and the resistance.
      - Class 2- The resistance is between the fulcrum and the effort applied.
- - - - The ration between the number of rotation of the pinion and the velocity of the movement of the rack is expresed by this equation:
        L = P·Z·N
      - -L, is the velocity of the rack`s movement in millimiters per minute.
        -P, is the distance between two consecutive teeth in millimeters.
        -Z, is the number of teeth in the pinion.
        -N, is the number of rotations per minute of the pinion.
      - Nut and bold system
        
        This consists of a bolt or threaded bar and a nut that has the same interior diameter as the diameter of the bolt
        
        If the bolt rotates and the nut can´t turn, the nuts moves in a liner motion along the threaded axle.
        
        If the nut rotates in a fixed position, the bolt will move in a liner motion.
        
        Winch and crank handle
        
        A winch and crank handle consist of a drum that rotates and a crank handle that allows to pull or lift objects.
        
        A winch is balanced when it satisfies this equation:
        F·d = R·r => F = R· R·r/d
        
        -F, is the force applied and R, the resistance.
        -r, is the radius of the winch and d, the length of the cranck handle.
        
        A crank is a bar attached to an axle that is used to turn it.
  - - - This is composed of a crank and a road called a connecting rod or link.
      - This rod has articulated joints at each end - one is connected to the crank and the other tp the slider.
      - The slider produces a reciprocating motion.
      - Crankshaft
        
        This is set of connecting rods attached to a jointed axle. Each of the joints of the axle acts as a crank.
        
        A crankshaft transforms the rotary motion of an axle into a reciprocating motion with different connecting rods moving at different times.
        
        Cam
        
        This is basically a rotating object that pushes a follower as it moves. We can change the shape and the usable profiles that are more or less pointed to produce more complex movements.
        
        A cam transforms rotary motion into reciprocating in the follower or bar.
        
        Eccentric cam
        
        This cosists of a wheel with an off-centre rotation axle that doesn't coincide with the centre of its circumference.
        
        It transforms the rotary motion of the wheel into reciprocating motion in the follower.
        
        The distance between the centre of the circumference and the rotation axle is called eccentricity.
- - - - Springs are devices that absorb energy. This energy can be relased later, little by little or all at once.
      - Springs work in different ways
        
        By compression: The spring is compressed, for example, in a chair.
        
        By traction: The spring is stretched, for example, in a bed frame.
        
        By torsion: The spring is twisted, for example, in a clothes peg.
      - Shock absorbers, are made of steel spiral spring, while suspension sysytems use very flexible metal strips, joined at the centre.
        
        Shock absorber
        
        Suspension system
  - - - Cardan joint
      - Oldham joint